Textbook in PDF format The energy transtion has created opportunities towards decarbonization. While renewable energies are abundant, they are non programmable resources. Hydrogen can be the bridge between the rewewable energy and the chemical and power industries. However, its difficult transportation calls for its transformation into more handy chemicals such as ammonia or methane as energy carriers. This book presents all the steps from the hydrogen production to its storage in the form of chemicals and their use within a decarbonized and defossilized indsutry • Presents the journey from renewable energy to the use of hydrogen carriers - ammonia and methane. • Evaluates the use of hydrogen for the production of chemicals as a means to store energy. • Evaluates the production of power from the stored hydrogen. Exploring Hydrogen Production: From Traditional to Sustainable Approaches Sustainable Low-Carbon Hydrogen Potential from the Olive Oil Industry Waste: A Case Study in Western Andalusia Materials for Hydrogen Processing Catalysis for Methane Synthesis Catalysts for Ammonia Production at Lower Temperature Additive Manufacturing Applied to Catalyst Supports Methane and Ammonia: Reactor Configuration and Design Process Design and Operation for Green Hydrogen and Derivatives Decentralized Production of Sustainable Small-Scale Ammonia Design and Operation of Low-Carbon Ammonia Supply Chains Hydrogen and Its Carriers: Production Pathways and Utilization Strategies